#include <stdio.h>

int swap(int x,int y)
{
	int temp;
	temp = x;
	x = y;
	y = temp;
}

int main(int argc,char *argv[])
{
	int a = 10;
	int b = 20;
	swap(a,b);
	printf("a = %d\n",a);
	printf("b = %d\n",b);
	
	return 0;
}